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When either of the oil pump hoses has been removed, air may become trapped inside, which will then obstruct oil flow. 06 Grizzly 660 Service Manual more. Make sure that there is plenty of engine oil in the oil tank and that oil flow is riot restricted. 2017 Chevy Astro Passenger Van Manual.
Place a rag under the oil pump. Loosen the air bleeder screw on the oil pump a couple of turns until oil flows out, and then tighten the bleeder screw securely. Provide sufficient engine cooling by running water through the cooling hose (see the Cooling System Flushing section). Start the engine, keep it at idling speed and check the oil flow through the transparent outlet hose.
Keep the engine running until the air bubbles in the outlet hose disappear.